20111102221 has 12 divisors (see below), whose sum is σ = 24415655968. Its totient is φ = 16224080832.

The previous prime is 20111102183. The next prime is 20111102251. The reversal of 20111102221 is 12220111102.

It is not a de Polignac number, because 20111102221 - 2⁷ = 20111102093 is a prime.

It is a super-2 number, since 2×20111102221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111102251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4968591 + ... + 4972636.

Almost surely, 2^20111102221 is an apocalyptic number.

It is an amenable number.

20111102221 is a deficient number, since it is larger than the sum of its proper divisors (4304553747).

20111102221 is an equidigital number, since it uses as much as digits as its factorization.

20111102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9941268 (or 9941251 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20111102221 its reverse (12220111102), we get a palindrome (32331213323).

The spelling of 20111102221 in words is "twenty billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".